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But in a tight race, every delegate is critical, and the Clinton campaign Thursday dispatched former President Clinton to campaign for his wife in Wyoming, which holds Democratic caucuses Saturday.

Both Democratic candidates are scheduled to campaign in Wyoming Friday.

The Wyoming party will divvy up 12 delegates based on the caucus results.

Clinton was headed Thursday to Mississippi, which holds a primary March 11. Mississippi has 33 delegates at stake.

Obama planned to spend the day in his hometown of Chicago, Illinois, planning his campaign strategy with his staff.

The two candidates are separated by fewer than 100 delegates, CNN estimates, with Obama leading Clinton 1,520 to 1,424.

The closeness of the delegate race has put the controversy over how the Democratic party handles the Michigan and Florida delegations back in the spotlight.

The national party penalized each state for moving their primaries before February 5 by stripping each state of its delegates, turning the January 15 primary in Michigan and the January 29 primary in Florida into largely symbolic contests.

Clinton won both contests after she and the rest of the top-tier candidates declined to campaign in either state before the voting began.

But political leaders in Florida and a Michigan are pushing to have their delegates seated at the national convention in August.

If the delegations are seated, it could significantly affect who receives the Democratic nomination. Florida has 210 delegates at stake, and Michigan has 156. Allocate the remaining delegates »

On Wednesday, Florida Gov. Charlie Crist, a Republican, and Michigan Gov. Jennifer Granholm, a Democrat, called on the Democratic National Committee to seat their states' delegations. They accused the party in a statement of silencing "the voices of 5,163,271 Americans" who voted in their primaries.

"It is intolerable that the national political parties have denied the citizens of Michigan and Florida their votes and voices at their respective national conventions," they wrote.

Democratic National Committee Chairman Howard Dean Thursday said the states can either come up with a new plan to choose a slate of delegates or appeal to the party's credentials committee when the convention opens in August.

"The rules were set a year and a half ago. Florida and Michigan voted for them and then decided that they didn't need to abide by the rules. When you're in a contest you do need to abide by the rules," he told CNN Thursday.

Florida and Michigan could hold new primaries or caucuses to allocate their delegates. Crist said he would be willing to allow the Democrats to hold another primary but was opposed to having the state pay for it.

The congressional delegations of Florida and Michigan also met on Capitol Hill Wednesday night to discuss options.